Now, this has been - this is a well-known, longstanding problem.

It is a well-known problem which is extremely subtle and probably not fully understood by anyone.

Ozone cracking is a well-known problem affecting natural rubber for example.

This has been a well-known problem for former Broncos running backs.

Despite their growing ranks, men who stay home still face a problem well-known to women in the same position: isolation.

But the report also pointed out a well-known problem with citrus groves.

Geographic names can be very direct labels, but can also cause a number of well-known problems.

Despite several well-known problems concerning the implementation of this law, I consider its enactment to be a very welcome step in the right direction.

Such contamination is a well-known problem, one that has tripped up even the most respected scientists.

This last statement denotes the will to overcome the well-known problem every artist has to face in the beginning, namely that art does not pay.